Process of preparing 4-hydroxy-para-phenyl-ortho-benzoyl-benzoic acid



patented 2, 193.

PHILIP it. e-ncoerns, or wasnrne-ron, nrsrnro'r or conurenra; nnnioernn 'ro THE PEOPLE Ann THE e-ovnnmvrnnr or rrrn -urirrnn STATES or Manama I rnocisss or P nane e-rrrnnoXY-reaarrrni rr.o irndnnnzort iannzoio ACID No Drawing.

Application filed. August a, race." Serial No. 384,508.

(GRANTED UNDER THE 15.01 MARGH 3, 18233, MEEHDED APRIL 30; 1928; 370 0. 757i This application is made under the act approved April 30, 1928 and the invention herein described may be manufactured and used by and for the Government for governmental purposes without payment to me of any royalty thereon.

T have discovered that l-hydroxyparaphenyl-ortho-benzoyl-benzoic cid may be prepared by treating the i-halogen-paraphenyl-oi'tho-benzoylbenzoic acic, or its salts in a water or alcoholic solution with alkaline reacting subssances. The reaction proceeds at a reasonable rate at elevated temperatures, the velocity of reaction increasing in proportion to the temperature. In carrying out the reaction, any suitable alkaline reacting substance may be used, such as caustic soda or potash sodium or potassium carbonate or the like, all of these alkaline sul stances giving the same end product.

The general reaction may be expressed by the follow graphic formula in which M repre entsa metallic radicle and hlg represents a halogen atom:

The product obtained is l-hydrozzy-paraphenyl-orthobenzoyl-benzoic acid having a melting point of 246-248 C. after recrystallizing the crude product from glacial acetic acid.

/Vithout iimiting my invention to any particular procedure the following example in which parts by weight are given illustrates the application of my invention in the pre ferred forms: A Il'llXbllX'G of parts of 4 chloro-para-phenyl-ortho-benzoyl benzoic acid parts sodium hydroxide in the form of a per cent solution with parts of water is heated in an agitated pressure vessel at 150220 C. for a period of 12 hours. The pressure is maintained between and 250 pounds per square inch. At the end of this period,- the reaction mass which is a clear dark yellow to light brown solution is diluted, filtered, and cooled to room temperature. The filtrate is then added to 1000 parts I or" iced 3 per cent sulfuric acid. The precipltated crude p; duct which has a slight pink color is ltered and washed free of acid with boiling water. I is 30.8 parts corresponding to 96.9 per cent of heory with a melting point of 236-2 l0 C. .13; er making adilute ammonium salt solution and reprecipitating with dilute sulfuric acid the melting point is"2-i0 U Y it is v obvious that instead of starting with lchlor0-para-phenyl ortlio-benzoyl- The yield of dried product .7

benzoic acid any other para halogen derivative may be employed.

i am aware that numerous details of the process may be varied through a wide range without departing from the spirit of this invention and I do not desire limiting the patent granted hereon otherwise than as necessitated by theprior art. I I

It is readily appreciated that when the operating temperature is above 200 (3., that a shorter reaction period is required then when C. is used. A temperature in excess of 220 C. gives rise to dark reaction products I while a temperature below 150 C. unneces- V sarily prolongs the reaction time. The pres- I para phenylortho benzoyl benzoic acid" which comprises heating d-chloro-paraphenyl-ortho-benzoyl-benzoic acid with an alkaline reacting substance whereby the chlorino atom is replaced by an hydroxyl group accompanied by the formation of an alkali metal chloride.

3. The process of preparing 4-hydroxypara phenyl ortho benzoyl benzoic acid which comprises heating 4-cl1lor'o-parapl1enyl-ortho-benzoyl-benzoic acid with a so: lution of caustic alkali to a temperature of between 150220 C. at a pressure of 100-250 pounds per square inch, whereby the chlorine atom is v split off to form an alkali metal chloride and replaced by an hydroxyl group.

4. The process of preparing -hydroxyjpara phenyl ortho benzoyl benzoic acid which comprises heating approximately 1 molecular proportion of 4 chloro paraphenyl-ortho-benzoyl-benzoic acid with a slight excess over three molecular proportions of caustic alkali in the form of its water solution at a temperature of between 150 and 220 C. and at a pressure of to 250 pounds per square inch for a prolonged period of time, cooling and precipitating out the prodnot.

5. As a new article of manufacture -hydroxy para -phenyl ortho -benzoyl -benzoic acid having most probably the following formula ll) OH 0 00 In testimony whereof I have hereunto subscribed my name.

PHILIP H. GROGGINS. 

